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\begin{equation*}
W(y_1, y_2, y_3)=\left| 
\begin{array}{ccc}
1 &amp; e^x &amp; e^{-x}\\
0 &amp; e^x &amp; -e^{-x}\\
0 &amp; e^x &amp; e^{-x}
\end{array}
\right|=\left| 
\begin{array}{cc}
e^x &amp; -e^{-x}\\
e^x &amp; e^{-x}\\
\end{array}
\right|=2.
\end{equation*}
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